Research Of High-precision Seismic Data Processing Technology In Paralic Zone Of ShengLi Oil Field

Exploration in Paralic Zone mainly carried in coastal mud flat, TZ zone and shallow water. For filed acquisition presently, Difference of source, geophone and surface lithology made Wavelet recorded in coastal mud flat, TZ zone and shallow water different, Data quality different greatly, phase disconsistency, events between land and shallow water with poor continuity, low S/N, structure changed, and dynamic charater of reflection canot be applied to resevior inversion and oil-gas prediction.Base on seimic exploration character in Paralic zone, seismic data processing technique has developed systematically. In light of wavelet difference, we studied processing technique on amplitude and wavelet. It is able to solve data amplitude difference applying surface consistent amplitude correction and residual amplitude correction .wavelet compress and consistent correction can be conducted by using wavelet processing technique such as surface consistent deconvolution, two step deconvolution, match filter, etc. For surface variation, Technique of wave-equation datum static based on topographic inversion was put forward, by this method, it can make near surface velocity model and solve static question in Paralic Zone when velocity inverse exist near surface.On receiver secondary location, We developed double circle location method and receiver space difference correction, question of receiver drift caused by wind wave, tide, sea current was solved betterly. To aim at noise character of data in Paralic Zone, the paper also studied high fidelity noise attenuation technique, multiple multi-suppress method with predictive deconvolution, correlation filter, randon transform, wave equation and optimum combination. According to mechanism of production and character that seismic data attribute to different mathematics district, geophysical district and multi-dimension district of all kind of noise, We developed multiple attenuation technique based on data reconstruction. For imaging, We developed dominant energy optimize stack technique, moveout vertical stack technique, CRP stack technique, full equation coefficient Finite-difference migration technique and pre-stack time migration technique. It is basicly solved the question of stack imaging and migration imaging of data in Paralic Zone.According to research result, seismic data processing of Guojuzi area, Zhuangxi area in Shengli Oil Filed has improved data imaging precision in Paralic Zone, better result has gotten.